Ground-glass attachment for cameras



M. BAUER.

GROUND GLASS ATTACHMENT FOR CAMERAS. No. 402,712.

(No Model.)

Patented May 7, 1889.

A TTORNEYS.

UNITED STATES PATENT OFFICE.

MAX BAUER, OF BROOKLYN, NEIY YORK.

GROUND-GLASS ATTACHMENT FOR CAMERAS.

SPECIFICATION forming part of Letters Patent No. 402,712, dated May *7,1889.

Application filed September 10, 1888. Serial No. 284,976. (No model-l Toa]! 157mm it 71mg concern/.-

Be it known that I, MAX BAUER, of Brookl yn,in the county of Kings andState of New York, have invented a new and Improved Ground-GlassAttachment for Cameras, of which the following is a full, clear, andexact description.

The object of the invention is to provide a new and improved attachmentfor holding ground glass to the back of a camera, at the same timeserving to hold the plate-holder in place.

The invention consists of a back frame, springs secured to the said backframe, and a ground glass secured to the ends of the said springs, sothat thelattcr supports the ground glass on the back frame.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a face view of the improvement with parts broken out. Fig. 2is a sectional plan view of the same on the line a 50 of Fig. 1. Fig. 3is a sectional end elevation of the same on the line 3 y of Fig. l, andFig. 4 is a rear face view of part of the ground-glass frame andsprings.

The back frame, A, of the camera supports two parallel springs, B B,secured in their middle by rivets or screws C, or other suitable means,to the said back frame, A. The free ends of the sprii'igs B B aresecured to the rear side of the ground-glass frame D, supporting, in theusual manner, the ground glass E. The springs BB are fastened to twoopposite sides of the said frame D near their outer ends, as is plainlyshown in the drawings.

The springs B are preferably placed in grooves F, formed in cleats G,running parallel with each other, and secured on the outside of the backframe, A. The inner edges of the cleats G also form a resting-place forthe shoulders D, formed on the two opposite sides of the frame D, andserving to hold the said frame and the ground glass E in place on theback frame, A.

Each of the cleats G is provided near its outer end with an offset orshoulder, G,

against which fit the outer edges of the oppo- A similar shoulder,

site sides of the frame D.

D, is formed atthe left-hand end of the frame D, said shoulder abuttingagainst the cleat G connecting with the cleats G, before mentioned. Inthe right-hand end of the frame D is formed a notch, H, for permittingthe operator to conveniently open the frame D in order to insert theplate-holder.

The ends of the springs B B are preferably secured, by means of screwsor rivets I, to two opposite sides of the frame D, said screws or rivetsI passing through longitudinal slots J, one of which is formed in eachend of each spring B. These slots J permit a free move ment of thesprings B when the frame D is opened for the insertion of theplate-holder. The springs B B have the tendency to hold the frame D andits ground glass E tightly in place on the back frame, A, so that theground glass E is always in place on the frame A, said springs B Bforming the support for the said frame D and the ground glass E.

lVhen the operator desires to insert the plate-holder, he takes hold ofthe frame D by its notch H and pulls the said frame outward sufficientlyto insert one end of the plateholder between the frame A and the frameD. The operator then pushes the plate-holder inward, whereby the springsB B yield and permit a free and easy insertion of the plateholder. henthe latter is pushed fully into place 011 the frame A, the springs B Bpress the frame D firmly against the plate-holder, so that the latter isheld firmly in place on the frame A.

Thus it will be seen that the arrangement, as shown and described, has atwofold purpose-first, of supporting the frame 1) and its ground glass Eon the back frame, A, and, second, of holdii'lg the plate-holder inplace when inserted on the back frame.

It will further be seen that the entire arrangement has a very neatappearance, and the springs B are completely out of sight, being coveredby the frame D in the recesses F.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patentl. A ground-glass attachment for cameras,comprising a back frame, springs secured to the said back frame, and aground-glass frame, on which the free ends of the said springs aresecured so that the said. springs support the ground-glass frame on thesaid back frame, substantially as shown and described.

2. The combination, with a back frame provided with cleats each having arecess, of a spring secured in its middle in the recess of each of thesaid cleats, and a ground-glass frame secured to the free ends of thesaid springs at two opposite sides, substantially as shown anddescribed.

3. The combination, with a back frame pr0- vided with two parallelcleats each having a recess, of a spring secured in its middle in therecess of each of the said cleats, each of the said springs beingprovided at its ends with slots, a frame containing the ground glass andsupported on the said springs, and screws pass- MAX BAUER.

Witnesses:

EDGAR TATE, C. SEDGWICK.

